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• atomicity
• POSIX and MPI-IO access of the same file
• reading empty data expecting 0s (default fill-value)

There are other changes required in the library basically to sync with timestamps instead of barriers when one rank is expected to read what another rank wrote.

Those changes can be obtained from 

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1. create pool with dmg and export related env variables

2. export HDF5_PARAPREFIX=daos:

3. mpirun -np 6 8 --hostfile ~/cli_hosts ./testphdf5

4. mpirun -np 6 8 --hostfile ~/cli_hosts ./t_shapesame
   

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